posted by kj .
Most proteins (do or don't) pass through the plasma membrane? Explain?
Substances that dissolve in (lipids or water) can more readily pass across the plasma membrane. Explain
Ions can cross the plasma membrane more easily if they have the (same or opposite) charge as the membrane. Explain.
Plasma membranes have special molecules that help to transport substances across the membranes. These molecules are named what?